Figure 2. IL-4 regulation in Tfh cells.
i) IL-4/STAT6 signalling leads to upregulation of Batf that in turn cooperates with IRF4 to bind to CNS2 region promoting IL-4 production. ii) Batf is also upregulated by IL-6/STAT3 signalling further activating c-MAF which binds to CNS locus leading to IL-4 production.